自80年代起一随着“三北”防护林体系的建设．在沙区大规模营造了以杨、柳、偷和障子松为主的防风固沙林。加之飞播造林种草引进和扩大了花棒、沙枣、紫穗槐、沙棘、沙打旺、草木橡、柠条等优良固沙植物的种类及种植面积，从而大大改变了沙区原来的植被组成和盖度，使林木害虫? Since the 1980s, with the “Three Norths” shelterbelt system construction. A large number of windbreaks and sand-fixing forests dominated by poplar, willow, stealing and Shizuisong were built in the sand area. In addition, aerial seeding afforestation grass introduced and expanded the species and planting area of ​​fine sand-fixing plants such as fescue, jujube, Amorpha fruticosa, seabuckthorn, sand mulberry, kaffir wood, kadaira and so on, which greatly changed the original vegetation composition And cover to make forest pests?